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Updated TextSymbolizer (markdown)

tmcw 2011-12-09 12:45:11 -08:00
parent 4cec2974b6
commit 39cca49437
1 changed files with 51 additions and 41 deletions
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TextSymbolizer.md

@ -1,7 +1,3 @@
<!-- Name: TextSymbolizer -->
<!-- Version: 39 -->
<!-- Last-Modified: 2011/09/15 16:28:11 -->
<!-- Author: herm -->
## Configuration Options for TextSymbolizer
| *parameter* | *value* | *description* | *unit* | *default* |
@ -44,45 +40,51 @@ In Mapnik2 all underscores "_" are replaced by dashes "-" (e.g. avoid-edges inst
## Examples
Some examples of Mapnik's ability to place text along lines:
[[BR]]
[[Image(http://trac.mapnik.org/raw-attachment/ticket/62/output_old.png)]]
Some examples of Mapnik's ability to place text along lines:
![thumb](http://trac.mapnik.org/raw-attachment/ticket/62/output_old.png)
### XML
#!xml
<TextSymbolizer name="FIELD_NAME" face_name="DejaVu Sans Book" size="10" fill="black" halo_fill= "white" halo_radius="1" placement="line" allow_overlap="false"/>
```xml
#!xml
<TextSymbolizer name="FIELD_NAME" face_name="DejaVu Sans Book" size="10" fill="black" halo_fill= "white" halo_radius="1" placement="line" allow_overlap="false"/>
```
See [wiki:XMLGettingStarted] for more XML example uses of TextSymbolizer.
### Python
#!python
t = TextSymbolizer('FIELD_NAME', 'DejaVu Sans Book', 10, Color('black'))
t.halo_fill = Color('white')
t.halo_radius = 1
t.label_placement = label_placement.LINE_PLACEMENT # POINT_PLACEMENT is default
dir(t) # for the rest of the attributes
```python
#!python
t = TextSymbolizer('FIELD_NAME', 'DejaVu Sans Book', 10, Color('black'))
t.halo_fill = Color('white')
t.halo_radius = 1
t.label_placement = label_placement.LINE_PLACEMENT # POINT_PLACEMENT is default
dir(t) # for the rest of the attributes
```
### C++
#!cpp
#include <mapnik/map.hpp>
#include <mapnik/font_engine_freetype.hpp>
```cpp
#!cpp
#include <mapnik/map.hpp>
#include <mapnik/font_engine_freetype.hpp>
using namespace mapnik;
try {
freetype_engine::register_font("/path/to/font.ttf");
/* some code */
rule_type rule;
text_symbolizer ts("FIELD_NAME", "DejaVu Sans Book", 10, color(0, 0, 0));
ts.set_halo_fill(color(255, 255, 200));
ts.set_halo_radius(1);
rule.append(ts);
}
using namespace mapnik;
try {
freetype_engine::register_font("/path/to/font.ttf");
/* some code */
rule_type rule;
text_symbolizer ts("FIELD_NAME", "DejaVu Sans Book", 10, color(0, 0, 0));
ts.set_halo_fill(color(255, 255, 200));
ts.set_halo_radius(1);
rule.append(ts);
}
```
The first parameter is the field name of a database field, or from a shape file, or an osm file. In case of a shape file or osm file, the field name is case sensitive.
You must load the needed fonts first, otherwise you'll get a run time error. But you can load as many true type fonts as you like. Mapnik is coming with a couple of fonts in "mapnik/fonts". I recommend to load all of this fonts, regardless if you need them or not.
@ -109,22 +111,30 @@ Note: Whitespace is ignored, e.g. "N,S,15,10" and "N, S,15,10" and "N, S, 15, 10
An XML example might look like:
#!xml
<TextSymbolizer
name="[label]"
allow-overlap="false"
face-name="DejaVu Sans Book"
placement-type="simple"
placements="N,S,15,10,8"
/>
```xml
#!xml
<TextSymbolizer
name="[label]"
allow-overlap="false"
face-name="DejaVu Sans Book"
placement-type="simple"
placements="N,S,15,10,8"
/>
```
## New syntax
Starting with r3354 Mapnik2 supports a new syntax:
#!xml
<TextSymbolizer name="[label]" />
```
#!xml
<TextSymbolizer name="[label]" />
```
becomes
#!xml
<TextSymbolizer>[label]</TextSymbolizer>
```xml
#!xml
<TextSymbolizer>[label]</TextSymbolizer>
```
This change was made to be forward compatible with changes to text formatting being introduced in later versions.